Empress Catherine II Saint Petersburg Mining University (St. Petersburg, Russia)

A. P. Petkova, Dr. Eng., Prof., Dept. of Materials Science and Technology of Art Products, apetkova@inbox.ru
V. A. Zlotin, Postgraduate Student, Dept. of Materials Science and Technology of Art Products, zlotinvladimir@mail.ru
Ya. E. Gekht, Student, Dept. of Materials Science and Technology of Art Products, jangech95@gmail.com

ITMO University (St. Petersburg, Russia)
V. S. Borisova, Student, Faculty of Technology Management and Innovation, vsnikitina2001@gmail.com

National Research Center "Kurchatov Institute" - Central Research Institute of Structural Materials "Prometey" (St. Petersburg, Russia)

G. Yu. Kalinin, Dr. Eng., Associate Prof.

The paper considers the possibility of using composite polymer-metal coatings to reduce water permeability. Coatings including modified fluoroplastic enamel (MFPE) and aluminum have been prepared and tested. The aluminum coating was applied by cold gas-dynamic spraying. MFPE was modified to increase the adhesion and crosslinking density of the coating using carbon nanotubes, SiC, h-BN nanoparticles, and a photoinitiator 819 for UV curing. The Devanathan-Stachurski method was used as a method for estimating hydrogen diffusion through a coated metal. Graphite coating was used for testing polymer coatings, which was also separately tested for hydrogen permeability. The diffusion coefficients and the diffusion flow of hydrogen through steel with and without coatings have been experimentally determined. The reduction coefficients and efficiency of reducing the diffusion and diffusion flow of hydrogen are determined for the coatings. It was found that MFPE /Al coatings can ensure the effectiveness of reducing diffusion by 87.7 % and diffusion flow by 77.1 %. For MFPE, these values were 68.8 % and 67 %, respectively, and for graphite – 52.1 % and 57.4 %, respectively. The determining influence on the protective properties of a fluoroplastic coating is exerted by the type of nano-additives (SiC or h-BN) and their ability to distribute evenly, where the best combination is CNT with SiC with the maximum ratio of diffusion reduction coefficients 89.5 % and permeability 86.8 %. The patterns identified for fluoroplastic compounds are fully preserved on coatings with an adhesive layer of Al+AlOOH, which increases the coating thickness and increases the effectiveness of diffusion reduction for all formulations, including CNTs with SiC up to 97 % and diffusion flux up to 89.3 %. The possibility of using a composite coating for in-tube coatings during additional testing is proposed.

1. Zhdaneev O. V. Providing technological sovereignty of the fuel and energy complex of Russian Federation. Zapiski Gornogo instituta. 2022. Vol. 258. pp. 1061–1070. DOI: 10.31897/PMI.2022.107
2. Shammazov I. A., Borisov A. V., Aleksandruk B. S., Lopatenko G. V., Nikitina V. Algorithmic Models for Determining the Flow Patterns of Oil Pipelines in Gravity Sections. International Journal of Engineering, Transactions A: Basics. 2025. Vol. 38 (10). pp. 2476–2485. DOI: 10.5829/ije.2025.38.10a.22
3. Shammazov I. A., Borisov A. V., Aleksandruk B. S. et al. Features of the effect of complicated mining conditions for construction and operation of self-flowing setions of pipeline transport. Bezopasnost truda v promyshlennosti. 2025. No. 7. pp. 39–43. DOI: 10.24000/0409-2961-2025-7-39-43
4. Ermakov B. S., Ermakov S. B., Vologzhanina S. A., Khuznakhmetov R. M. Relationship between operating conditions and the emergence of nano- and ultradispersed grain boundary defects in weld joints. Tsvetnye metally. 2023. No. 8. pp. 80–85.
5. Litvinenko V. S., Tsvetkov P. S., Dvoinikov M. V., Buslaev G. V. Barriers of realizing hydrogen initiatives in the context of sustainable development of global power engineering. Zapiski Gornogo instituta. 2020. Vol. 244. pp. 428–438. DOI: 10.31897/pmi.2020.4.5
6. Zagashvili Y., Kuzmin A., Buslaev G. et al. Small-scaled production of blue hydrogen with reduced carbon footprint. Energies. 2021. Vol. 14. No. 16. p. 5194. DOI: 10.3390/en14165194
7. Nechaev Y. S. Metallic materials for the hydrogen energy industry and main gas pipelines: complex physical problems of aging, embrittlement, and failure. Physics-Uspekhi. 2008. Vol. 51 (7). p. 681. DOI: 10.1070/PU2008v051n07ABEH006570
8. Li X. et al. Review of hydrogen embrittlement effect on fracture toughness of metallic materials: Influencing factors, and predictive models. Engineering Fracture Mechanics. 2025. p. 111392. DOI: 10.1016/j.engfracmech.2025.111392
9. Xing X., Cheng R., Cui G., et al. Quantification of the temperature threshold of hydrogen embrittlement in X90 pipeline steel. Materials Science and Engineering: A. 2021. Vol. 800. p. 140118. DOI: 10.1016/j.msea.2020.140118
10. Bolobov V. I., Tsvetkov A. S., Popov G. G., Dagaev S. E., Salnikov D. R., Tigranyan G. A. Comparison of Existing Methods for Studying Compatibility of Pipeline Steels with Compressed Hydrogen. International Journal of Engineering, Transactions A: Basics. 2026. Vol. 39 (04). pp. 917–924. DOI: 10.5829/IJE.2026.39.04A.10
11. Bolobov V. I., Zhukov V. S., Tsvetkov A. S., Tigranyan G. A., Kondratieva V. M. Using the magnetic anisotropy method to determine the boundaries of stress-corrosion failure and prevent hydrogen damage to pipe steels. Chernye metally. 2025. No. 4. pp. 55–61.
12. Hu S. et al. A quantification study of hydrogen-induced cohesion reduction at the atomic scale. Materials & Design. 2022. Vol. 218. p. 110702. DOI: 10.1016/j.matdes.2022.110702

13. Mansilla G., Hereñú S., Brandaleze E. Hydrogen effects on low cycle fatigue of high strength steels. Materials Science and Technology. 2014. Vol. 30 (4). pp. 501–505. DOI: 10.1179/1743284713Y.0000000328
14. Borodin V. I. et al. Application of the Electrochemical Permeation Method for Hydrogen Diffusion Coefficient Determination in Pipeline Steel 10G2. Coatings. 2021. Vol. 11 (10). p. 1260. DOI: 10.3390/coatings11101260
15. Jack T. A. et al. Investigation of the hydrogen induced cracking behaviour of API 5L X65 pipeline steel. International Journal of Hydrogen Energy. 2020. Vol. 45 (35). pp. 17671–17684. DOI: 10.1016/j.ijhydene.2020.04.211
16. Thomas A., Szpunar J. A. Visualisation of diffusion sites and measurement of hydrogen traps in hot-rolled pipes. Materials Science and Technology. 2020. Vol. 36 (17). pp. 1870–1882. DOI: 10.1080/02670836.2020.1839205
17. Xiao S. et al. Hydrogen permeation barriers and preparation techniques: A review. Journal of Vacuum Science & Technology A. 2022. Vol. 40 (6). p. 060803. DOI: 10.1116/6.0002178
18. Henager C. H. Hydrogen permeation barrier coatings. Materials for the hydrogen economy. 2007. pp. 181–190. DOI: 10.1201/9781420006070
19. Samanta S. et al. Development of amorphous Ni-P coating over API X70 steel for hydrogen barrier application. Surface and Coatings Technology. 2020. Vol. 403. p. 126356. DOI: 10.1016/j.surfcoat.2020.126356
20. Kapuscinsky N. et al. Polymeric Coatings for Preventing Hydrogen Embrittlement in Industrial Storage and Transmission Systems. ACS Applied Engineering Materials. 2024. Vol. 2 (11). pp. 2488–2503. DOI: 10.1021/acsaenm.4c00367
21. Petkova A. P., Pryakhin E. I., Zlotin V. A., Gareev D. V. Comparative analysis of effectiveness of hydrogen permeability reducing via using protective coatings during its transportation, storage and production. Dizain. Materialy. Tekhnologiya. 2024. Vol. 4 (76). pp. 167–174. DOI: 10.46418/1990-8997_2024_4(76)_167_174
22. de Souza Brandolt C. et al. Determination of hydrogen trapping mechanisms by microprinting in Ni and Co coatings obtained by HVOF. Surface and Coatings Technology. 2019. Vol. 362. pp. 262–273. DOI: 10.1016/j.surfcoat.2019.01.111.23
23. Wetegrove M. et al. Preventing hydrogen embrittlement: the role of barrier coatings for the hydrogen economy. Hydrogen. 2023. Vol. 4 (2). pp. 307–322. DOI: 10.3390/hydrogen4020022
24. Sivenkov A. V., Konchus D. A., Gareev D. V., Pryakhin E. I. Application of Cr–Ni coatings by chemical-thermal treatment from lowmelting metal solutions. Chernye metally. 2024. No. 12. pp. 101–106.
25. Pryakhin E. I., Pribytkova D. A. Development and application of a complex polymer coating to ensure high corrosion resistance of the outer surface of steel pipes of urban heating networks. CIS Iron and Steel Review. 2025. Vol. 29. pp. 97–101.
26. Pryakhin E. I., Azarov V. A. Study of protective properties of fluoroplastic polymer compositions on steel samples with the aim of their potential use for internal coatings of main gas pipelines. Chernye metally. 2025. No.4. pp. 62–66.
27. Pauly S. Permeability and diffusion data. Polymer handbook. 1999. Vol. 2. VI/551. DOI: 10.1002/0471532053
28. Aman M. M., Mohammed B. S., Al-Yacouby A. M. Hydrogen Permeation Resistance of PVDF–Graphene Nanocomposite Coatings for Metallic Pipelines. Polymers. 2025. Vol. 17 (16). p. 2262. DOI: 10.3390/polym17162262
29. Yuan S. et al. A bi-layer orientated and functionalized graphenebased composite coating with unique hydrogen gas barrier and long-term anti-corrosion performance. Carbon. 2023. Vol. 205. pp. 54–68. DOI: 10.1016/j.carbon.2023.01.027
30. Guo H. X. et al. Enhanced anti-corrosion and hydrogen resistance performance for epoxy resin composite coating with modified boron nitride. International Journal of Hydrogen Energy. 2025. Vol. 141. pp. 35–45. DOI: 10.1016/j.ijhydene.2025.05.335
31. Kumar S. et al. Enhancement of hydrogen gas permeability in electrically aligned MWCNT-PMMA composite membranes. Micron. 2010. Vol. 41. No. 7. pp. 909–914. DOI: 10.1016/j.micron.2010.05.016
32. Nikolaychik A. V. et al. Influence of carbon nanomodifiers on the properties of paint and lacquer materials and coatings. Vesnik Vitsebskaga dzyarzhaunaga universiteta. 2010. No. 3. pp. 34–42.
33. Kurihara K., Serizawa A. Formation Mechanism of Two&Layered AlO (OH) Films on Aluminum Alloys via the Steam Coating Process. Advanced Materials Interfaces. 2025. pp. e00304. DOI: 10.1002/admi.202500304
34. Jones R. H., Thomas G. J. Materials for the hydrogen economy. CRC Press. 2007. p. 352. DOI: 10.1201/9781420006070
35. Tan X., Wan X. Hydrogen permeation behavior in Fe3Al-based alloy. Journal of Shanghai University (English Edition). 2000. Vol. 4 (3). pp. 250–253. DOI: 10.1007/s11741-000-0073-2
36. Pisarev A. A., Tsvetkov I. V., Marenkov E. D., Yarko S. S. Hydrogen permeability through metals. Proceedings of the Fifth International conference and Ninth International school of young scientists and specialists named after Kurdyumov A. A. 2014. Vol. 1. pp. 155–176.
37. Reddy K. S., Govindaraj Y., Neelakantan L. Hydrogen diffusion kinetics in dual-phase (DP 980) steel: The role of pre-strain and tensile stress. Electrochimica Acta. 2023. Vol. 439. p. 141727. DOI: 10.1016/j.electacta.2022.141727
38. Mohtadi-Bonab M. A., Masoumi M. Different aspects of hydrogen diffusion behavior in pipeline steel. Journal of Materials Research and Technology. 2023. Vol. 24. pp. 4762–4783. DOI: 10.1016/j.jmrt.2023.04.026
39. Liu L. et al. Fabrication and hydrogen permeation resistance of dense CrN coatings. Surface and Coatings Technology. 2022. Vol. 437. p. 128326. DOI: 10.1016/j.surfcoat.2022.128326
40. Akopov F. A. et al. SiC-based composite ceramics alloyed by carbon nanotubes. Vestnik Obyedinennogo instituta vysokikh temperatur. 2018. Vol. 1. No. 1. pp.51–55. DOI: 10.33849/2018112
41. Su Z. et al. Anisotropic thermally conductive flexible polymer composites filled with hexagonal born nitride (h-BN) platelets and ammine carbon nanotubes (CNT–NH2): Effects of the filler distribution and orientation. Composites Part A: Applied Science and Manufacturing. 2018. Vol. 109. pp. 402–412. DOI: 10.1016/j.compositesa.2018.03.021